the Tannoy is about perfect looks wise I'm only worried that they will have that "quacky" one driver soundWhile I cannot read into your individual sonic preferences, I think I understand what you're afraid of and can confirm the Wests sound nothing like that.
I lived with a pair years ago and found the sound very good: I enjoyed my BB King as much as I enjoyed symphonic Mahler. The sonic result had vivacity, energy, and dynamic impact. The instruments had sufficient weight ("flesh") and even a full orchestra sounded palpable. A recent model I listened to is better I think (IIRC the old sound!), it is more extended in the upper frequencies and, thereby, more dynamic and "clearer".
WHile I cant readily compare to your La Scala, I know the Klipschorns and IMO the Tannoys are better. BTW, the Klipschorns still an excellent speaker as well...
(BTW, there is a driver within the driver, rather than single driver -- it is actually a sort of two-way.)